v0.1.1 Add more file types

I decided to add more file types.

Installation instructions:

1. Download scratch-video.zip
2. Unzip it into it's own folder (e.g. a folder called scratch-video)
3. Make sure you have Python 3 installed
4. Open your command prompt in the scratch-video folder
5. Run pip install -r requirements.txt or if that doesn't work py -m pip install -r requirements.txt
6. And now you're all set to run scratchVideo.py

When you run it for the first time, it'll download the base project, and put it in a folder called project. It won't download it again, unless it detects project.json and video.sb3 are missing.